Circuit board and electronic equipment
By setting differential signal groups in the circuit board of the electronic device and optimizing the influence of the grid, the problem of noise interference of the differential signal line in the flexible circuit board is solved, and more stable data transmission is achieved.
Patent Information
- Application Number
- CN202311406724.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2023-10-26
- Publication Date
- 2025-04-29
AI Technical Summary
In electronic devices, the high-speed differential signal lines of the flexible circuit board are easily affected by the device itself or external radio frequency signals, resulting in the generation of common mode noise, which in turn affects the transmission stability of the signal.
By setting a differential signal group in the signal layer of the circuit board and using a grid in the formation, it is ensured that the difference between the overlap area of the differential signal line in the formation projection and the overlap area of the grid ground is less than the set threshold or an integer multiple of the set value, so that the influence of the grid ground on the differential signal line is uniform and noise interference is reduced.
It effectively reduces the discontinuity effect caused by the grid, improves the trace symmetry of the differential signal lines, and allows the noise signal to be subtracted and cancels during the decoding process, thereby improving the data transmission stability of the differential signal group.
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Figure CN119907174A_ABST
Abstract
Description
Technical Field
[0001] The present disclosure relates to the technical field of electronic hardware, and in particular to a circuit board and an electronic device. Background Art
[0002] With the rapid development of mobile communication technology, electronic devices such as mobile phones and tablet computers have become indispensable in people's daily lives. In electronic devices, high-speed interfaces such as screens and cameras are generally connected to the central processor using flexible circuit boards to achieve stacking flexibility in product structure design.
[0003] In order to ensure the bending reliability of flexible circuit boards, grid ground is usually used as the ground layer in the high-speed differential signal line area. The exposed part of the high-speed signal interface is easy to receive RF signals other than the device itself, which in turn causes common mode noise generated in the differential signal line. Summary of the invention
[0004] In order to overcome the problems existing in the related art, the present disclosure provides a circuit board and an electronic device.
[0005] According to a first aspect of an embodiment of the present disclosure, a circuit board is provided, comprising: a signal layer, provided with one or more differential signal groups, the differential signal groups comprising a plurality of differential signal lines parallel to each other; a ground layer, the ground layer comprising a grid ground, wherein the difference in the overlapping area between the projection of each differential signal line in at least one group of differential signal groups on the ground layer and the grid ground is less than a set threshold; or the difference in the overlapping area is an integer multiple of a set value.
[0006] In some embodiments, the differential signal group includes a first differential signal line and a second differential signal line; the grid ground includes multiple first ground lines and multiple second ground lines, wherein the overlapping area of the projection of the first differential signal line on the ground layer and the first ground line and the second ground line is a first overlapping area; the overlapping area of the projection of the second differential signal line on the ground layer and the first ground line and the second ground line is a second overlapping area; the difference between the first overlapping area and the second overlapping area is less than a set threshold, or the difference between the first overlapping area and the second overlapping area is an integer multiple of a set value.
[0007] In some embodiments, there is a first angle between the differential signal line and the first ground line, and the differential signal line transmits a first signal; the transmission length of the first signal is less than or equal to one sixth of the wavelength of the first signal, and the first angle is 23.5° to 28.5° or 113.5° to 118.5°; the transmission length of the first signal is greater than one sixth of the wavelength of the first signal, and the first angle is 15°-38° or 105° to 128°. In some embodiments, a plurality of first ground lines are arranged parallel to each other in the stratum, and a plurality of second ground lines are arranged parallel to each other in the stratum.
[0008] In some embodiments, a plurality of first ground lines are arranged in the stratum at equal intervals, and a plurality of second ground lines are arranged in the stratum at equal intervals.
[0009] In some embodiments, the first ground line and the second ground line are perpendicular to each other.
[0010] In some embodiments, there is a first angle between the differential signal line and the first ground line, the first angle is θ, the spacing between the first differential signal line and the second differential signal line is S, the spacing between the multiple second ground lines is H, and the following relationship is satisfied: Sinθ=S / H.
[0011] In some embodiments, the first angle also satisfies the following relationship: Sin(45°-θ)=S / (H / Sin45°).
[0012] In some embodiments, the first angle is 15° to 38° or 105° to 128°.
[0013] In some embodiments, the differential signal line includes a plurality of segments connected in sequence, and the extension directions of two segments connected to each other in the plurality of segments are such that the angle between the extension directions of the two segments connected to each other is 45° or 90°. In some embodiments, the differential signal line includes a first segment, a second segment, and a third segment with different extension directions, the first segment is connected to the second segment, and the second segment is connected to the third segment, wherein the angle between the extension direction of the first segment and the extension direction of the second segment is 45°; the angle between the extension direction of the second segment and the extension direction of the third segment is 45°; the angle between the extension direction of the first segment and the extension direction of the third segment is 0° or 90°.
[0014] In some embodiments, a difference between a length of the first differential signal line and a length of the second differential line is smaller than a set threshold.
[0015] In some embodiments, the differential signal line also includes a third differential signal line; wherein, the overlapping area of the projection of the third differential signal line on the formation and the first ground line and the second ground line is a third overlapping area; the difference between the first overlapping area, the second overlapping area and the third overlapping area is less than a set threshold; or the difference in overlapping areas is an integer multiple of a set value; the difference between the length of the first differential signal line, the length of the second differential line and the length of the third differential line is less than a set threshold.
[0016] In some embodiments, the length of the differential signal line is greater than or equal to 3.5 mm.
[0017] According to a second aspect of an embodiment of the present disclosure, there is provided an electronic device, comprising: the circuit board as described in any one of the first aspects.
[0018] In some embodiments, the circuit board is a flexible circuit board.
[0019] The technical solution provided by the embodiments of the present disclosure may include the following beneficial effects: the present disclosure reduces the discontinuity effect caused by the grid ground by making the difference in the overlapping area between the projection of the differential signal line in the differential signal group on the stratum and the grid ground less than a set threshold; or the difference in the overlapping area is an integer multiple of the set value, thereby effectively improving the symmetry of the routing of the differential signal lines, so that the grid ground has the same effect on the noise signals in the differential signal lines, and then in the process of decoding the differential signals, the noise signals in the differential signal lines can be subtracted and offset, thereby improving the data transmission stability of the differential signal group.
[0020] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and, together with the description, serve to explain the principles of the present disclosure.
[0022] Figure 1 The diagram is a top view of the structure of a ground layer and a signal layer of a circuit board according to an exemplary embodiment.
[0023] Figure 2 The diagram is a top view of the structure of a ground layer and a signal layer of another circuit board according to an exemplary embodiment.
[0024] Figure 3 The diagram is a top view of the structure of a ground layer and a signal layer of another circuit board according to an exemplary embodiment.
[0025] Figure 4The diagram is a top view of the structure of a ground layer and a signal layer of another circuit board according to an exemplary embodiment.
[0026] Figure 5 The single-ended insertion loss diagram of a channel is shown according to an embodiment of the related art.
[0027] Figure 6 A single-ended phase diagram of a channel is shown according to an embodiment of the related art.
[0028] Figure 7 is a single-ended noise result diagram shown according to an embodiment of the related art.
[0029] Figure 8 is a differential mode noise result diagram shown according to an embodiment of the related art.
[0030] Fig. 9 A signal eye diagram is shown according to an embodiment of the related art.
[0031] Fig.10 is a diagram of single-ended insertion loss of a channel according to an exemplary embodiment.
[0032] Fig.11 The figure is a single-ended phase diagram of a channel according to an exemplary embodiment.
[0033] Fig.12 is a single-ended noise result diagram shown according to an exemplary embodiment.
[0034] Fig.13 is a differential mode noise result diagram shown according to an exemplary embodiment.
[0035] Fig.14 A signal eye diagram is shown according to an exemplary embodiment.
[0036] Fig.15 The single-ended insertion loss diagram of a channel is shown according to an embodiment of the related art.
[0037] Fig.16 A single-ended phase diagram of a channel is shown according to an embodiment of the related art.
[0038] Fig.17 is a single-ended noise result diagram shown according to an embodiment of the related art.
[0039] Fig.18 is a differential mode noise result diagram shown according to an embodiment of the related art.
[0040] Fig.19 A signal eye diagram is shown according to an embodiment of the related art.
[0041] Fig. 20 is a diagram of single-ended insertion loss of a channel according to an exemplary embodiment.
[0042] Fig.21 The figure is a single-ended phase diagram of a channel according to an exemplary embodiment.
[0043] Fig. 22 is a single-ended noise result diagram shown according to an exemplary embodiment.
[0044] Fig.23 is a differential mode noise result diagram shown according to an exemplary embodiment.
[0045] Fig.24 A signal eye diagram is shown according to an exemplary embodiment.
[0046] Fig.25 The single-ended insertion loss diagram of a channel is shown according to an embodiment of the related art.
[0047] Fig.26 A single-ended phase diagram of a channel is shown according to an embodiment of the related art.
[0048] Fig. 27 is a single-ended noise result diagram shown according to an embodiment of the related art.
[0049] Fig.28 is a differential mode noise result diagram shown according to an embodiment of the related art.
[0050] Fig.29 A signal eye diagram is shown according to an embodiment of the related art.
[0051] Fig.30 is a diagram of single-ended insertion loss of a channel according to an exemplary embodiment.
[0052] Fig.31 The figure is a single-ended phase diagram of a channel according to an exemplary embodiment.
[0053] Fig.32 is a single-ended noise result diagram shown according to an exemplary embodiment.
[0054] Fig.33 is a differential mode noise result diagram shown according to an exemplary embodiment.
[0055] Fig.34 A signal eye diagram is shown according to an exemplary embodiment.
[0056] Fig.35 The single-ended insertion loss diagram of a channel is shown according to an embodiment of the related art.
[0057] Fig.36 A single-ended phase diagram of a channel is shown according to an embodiment of the related art.
[0058] Fig.37 is a single-ended noise result diagram shown according to an embodiment of the related art.
[0059] Fig.38 is a differential mode noise result diagram shown according to an embodiment of the related art.
[0060] Fig.39 A signal eye diagram is shown according to an embodiment of the related art.
[0061] Fig.40 is a diagram of single-ended insertion loss of a channel according to an exemplary embodiment.
[0062] Fig.41 The figure is a single-ended phase diagram of a channel according to an exemplary embodiment.
[0063] Fig.42 is a single-ended noise result diagram shown according to an exemplary embodiment.
[0064] Fig.43 is a differential mode noise result diagram shown according to an exemplary embodiment.
[0065] Fig.44 A signal eye diagram is shown according to an exemplary embodiment. DETAILED DESCRIPTION
[0066] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present disclosure. Instead, they are merely examples of devices and methods consistent with some aspects of the present disclosure as detailed in the appended claims.
[0067] In the related art, conductive materials may be added to the exposed parts of the differential signal lines for shielding protection, thereby reducing the noise signals from entering the differential signal lines.
[0068] However, due to structural reliability and layout limitations, this method is a mass-producible shielding measure that can only relatively reduce the degree of interference on the differential signal lines in most cases, and cannot completely solve the problem.
[0069] In order to solve the above technical problems, according to an embodiment of the present disclosure, a circuit board is provided, and the circuit board includes: a signal layer, which is provided with one or more differential signal groups, and the differential signal group includes a plurality of differential signal lines parallel to each other; a ground layer, and the ground layer includes a grid ground, wherein the difference in the overlapping area between the projection of each differential signal line in at least one group of differential signal groups on the ground layer and the grid ground is less than a set threshold; or the difference in the overlapping area is an integer multiple of a set value.
[0070] The present invention reduces the discontinuity effect caused by the grid ground by making the difference between the projection of the differential signal line in the differential signal group on the stratum and the overlapping area of the grid ground smaller than a set threshold, or the difference in the overlapping area is an integer multiple of the set value, thereby effectively improving the symmetry of the routing of the differential signal lines, so that the grid ground has the same effect on the noise signals in the differential signal lines, and further, in the process of decoding the differential signals, the noise signals in the differential signal lines can be subtracted and offset, thereby improving the data transmission stability of the differential signal group.
[0071] It can be understood that the circuit board involved in the present disclosure can be applicable to any terminal listed below.
[0072] It is understandable that the terminal involved in the present disclosure may also be referred to as a terminal device, a user equipment (User Equipment, UE), a mobile station (Mobile Station, MS), a mobile terminal (Mobile Terminal, MT), etc., which is a device that provides voice and / or data connectivity to users. For example, the terminal may be a handheld device with a wireless connection function, a vehicle-mounted device, etc. At present, some examples of terminals are: a smart phone (Mobile Phone), a pocket computer (Pocket Personal Computer, PPC), a handheld computer, a personal digital assistant (Personal Digital Assistant, PDA), a laptop computer, a tablet computer, a wearable device, or a vehicle-mounted device, etc. In addition, when it is a vehicle-to-everything (V2X) communication system, the terminal device may also be a vehicle-mounted device. It should be understood that the embodiments of the present disclosure do not limit the specific technology and specific device form adopted by the terminal.
[0073] Figure 1 The diagram is a top view of the structure of a ground layer and a signal layer of a circuit board according to an exemplary embodiment.
[0074] In some embodiments, Figure 1 As shown, the circuit board may include: a signal layer for transmitting signals and a ground layer for providing a reference ground.
[0075] The circuit board can be understood as a printed circuit board or an integrated circuit board. The circuit board is a multi-layer board structure, and the number of signal layers and ground layers can be selected and adjusted according to the number of layers required for the circuit board. The stacking order of the signal layers and ground layers can be selected and adjusted as needed, and is not specifically limited here. The specific structure of the circuit board can be selected and adjusted according to the product to which it is applied.
[0076] The signal layer may be provided with one or more differential signal groups, and the differential signal group may include a plurality of differential signal lines parallel to each other.
[0077] The differential signal group can transmit signals through differential transmission. Exemplarily, the differential signal group may include two differential signal lines. When the differential signal group transmits data, the two differential signal lines transmit signals together. The amplitudes of the signals transmitted by the two differential signal lines are the same, but the phases are opposite. The signal receiving end can determine the logic state sent by the sending end by comparing the difference between the two signal voltages.
[0078] The ground layer may include a grid ground. For example, the grid ground may be a grid structure formed by a conductor. The grid ground may enable the bottom layer to have higher bendability. By using the grid ground as the bottom layer in the circuit board, the bending reliability of the circuit board may be ensured, and the flexibility of product structure design and stacking may be improved.
[0079] During the signal transmission process of the differential signal line, the differential signal line is easy to receive the common mode noise generated by the device itself or external RF signal. When the ground layer adopts the grid ground, the asymmetry of the grid ground will make the grid ground have different effects on the differential signals of different differential signal lines, thereby increasing the component of the common mode noise of the RF signal converted to the differential mode noise, and the differential mode noise will be superimposed on the high-speed differential signal, causing the differential signal to be distorted, and may cause decoding failure at the signal receiving end.
[0080] By configuring each differential signal line in the differential signal group so that the difference between the projection of the ground layer and the overlapping area of the grid ground is less than a set threshold, or the difference in the overlapping area is an integer multiple of the set value, the grid ground is made equivalently symmetrical with respect to each differential signal line, so that the grid ground has the same effect on the differential signal of each differential signal line. This can make the common-mode noise that experiences the same effect when decoding the differential signal be offset when performing the difference operation, thereby improving the data transmission stability of the differential signal group.
[0081] Regarding the setting threshold, the setting threshold of the present disclosure is defined as that in the eye diagram judgment, the projection of each differential signal line in a differential signal group on the stratum and the overlapping area of the grid ground are considered to be equal, but in actual production they are not necessarily completely equal, but only basically equal. In the case where the overlapping areas are basically equal, the projection of each differential signal line in a differential signal group on the stratum and the overlapping area of the grid ground may have a certain difference, and the difference is the setting threshold.
[0082] Likewise, the integer multiples of the set value are not necessarily absolute integer multiples, but may have a certain difference, but can meet the eye diagram judgment requirement.
[0083] Configuring the difference to be less than the set threshold value can prevent the interference to the differential signal group from affecting the normal data transmission of the differential signal group. When the set threshold value is configured such that the difference is less than the set threshold value, the eye diagram of the signal transmitted by the differential signal group can meet the eye diagram judgment requirement.
[0084] Each differential signal line is configured so that the difference in the overlapping area between its projection on the stratum and the grid ground can also be an integer multiple of any value within a set range. When the difference in the overlapping area is configured to be an integer multiple of any value within the set range, the eye diagram of the signal transmitted by the differential signal group can meet the eye diagram judgment requirements.
[0085] The present disclosure can solve the noise interference problem caused by the different influences of the grid ground on the noise signal in the differential signal line by optimizing the influence of the grid ground on each differential signal line when the circuit board adopts the grid ground as the ground layer. By making the difference between the projection of the differential signal line in the ground layer and the overlap area of the grid ground less than the set threshold; or the difference in the overlap area is an integer multiple of the set value, the discontinuity effect caused by the grid ground can be reduced, and the symmetry of the differential signal line routing can be effectively improved, so that the grid ground has the same influence on the noise signal in the differential signal line, and then in the process of decoding the differential signal, the noise signal in the differential signal line can be subtracted and offset, thereby improving the data transmission stability of the differential signal group.
[0086] In some embodiments, Figure 1 As shown, the differential signal group 1 may include a first differential signal line 11 and a second differential signal line 12 .
[0087] When the differential signal group 1 performs data transmission, the first differential signal line 11 and the second differential signal line 12 can perform signal transmission together, and the signal transmitted by the first differential signal line 11 and the signal transmitted by the second differential signal line 12 have the same amplitude and opposite phase. The signal receiving end can determine the logic state sent by the sending end by comparing the difference between the two signal voltages.
[0088] The grid ground 2 may include a plurality of first ground lines 21 and a plurality of second ground lines 22 , and the first ground lines 21 and the second ground lines 22 may intersect to form a grid structure.
[0089] The overlap area of the projection of the first differential signal line 11 on the stratum and the first ground line 21 and the second ground line 22 is the first overlap area, and the overlap area of the projection of the second differential signal line 12 on the stratum and the first ground line 21 and the second ground line 22 is the second overlap area, and the difference between the first overlap area and the second overlap area is less than the set threshold; or the difference between the overlap areas is an integer multiple of the set value. Exemplarily, the first overlap area and the second overlap area can be equal.
[0090] By configuring the first differential signal line 11 and the second differential signal line 12 so that the difference between the projection on the stratum and the overlapping area of the first ground line 21 and the second ground line 22 is less than a set threshold; or the difference in the overlapping area is an integer multiple of the set value, the grid ground 2 is made equivalently symmetrical relative to the first differential signal line 11 and the second differential signal line 12, so that the first ground line 21 and the second ground line 22 have the same influence on the differential signals of the first differential signal line 11 and the second differential signal line 12, which can make the common-mode noise that experiences the same influence when decoding the differential signal be offset when performing the difference operation, thereby improving the data transmission stability of the differential signal group 1.
[0091] The present invention reduces the discontinuity effect caused by the grid ground 2 by making the difference between the projection of the first differential signal line 11 and the second differential signal line 12 on the stratum and the overlapping area of the first ground line 21 and the second ground line 22 less than a set threshold or the difference in the overlapping area is an integer multiple of the set value, effectively improving the symmetry of the differential signal line routing, so that the first ground line 21 and the second ground line 22 have the same influence on the differential signals of the first differential signal line 11 and the second differential signal line 12, and further, in the process of decoding the differential signal, the noise signals in the first differential signal line 11 and the second differential signal line 12 can be subtracted and offset, thereby improving the data transmission stability of the differential signal group 1.
[0092] In some embodiments, Figure 1 As shown, a plurality of first ground lines 21 are arranged in parallel with each other in the ground layer, and a plurality of second ground lines 22 are arranged in parallel with each other in the ground layer. This can make the ground line distribution of the grid ground 2 more regular, so that the first differential signal line 11 and the second differential signal line 12 can more easily achieve that the difference between the projection of the first differential signal line 11 and the second differential signal line 12 on the ground layer and the overlap area of the first ground line 21 and the second ground line 22 is less than a set threshold or the difference in the overlap area is an integer multiple of the set value, which can reduce the discontinuity effect caused by the grid ground 2, effectively improve the symmetry of the differential signal line routing, and thus improve the data transmission stability of the differential signal group 1.
[0093] In some embodiments, Figure 1 As shown, a plurality of first ground lines 21 are arranged in the ground layer at equal intervals, and a plurality of second ground lines 22 are arranged in the ground layer at equal intervals. This can make the ground line distribution of the grid ground 2 more uniform, so that the first differential signal line 11 and the second differential signal line 12 can more easily achieve that the difference between the projection of the first differential signal line 11 and the second differential signal line 12 on the ground layer and the overlap area of the first ground line 21 and the second ground line 22 is less than a set threshold or the difference in the overlap area is an integer multiple of the set value, which can reduce the discontinuity effect caused by the grid ground 2, effectively improve the symmetry of the differential signal line routing, and thus improve the data transmission stability of the differential signal group 1.
[0094] In some embodiments, Figure 1 As shown, the first ground line 21 and the second ground line 22 are perpendicular to each other. This can make the grid formed by the staggered first ground line 21 and the second ground line 22 of the grid ground 2 square, so that the grid of the grid ground 2 has symmetry, and the ground line distribution can be more uniform and symmetrical, so that the first differential signal line 11 and the second differential signal line 12 can more easily achieve the difference between the projection of the first differential signal line 11 and the second differential signal line 12 on the stratum and the overlap area of the first ground line 21 and the second ground line 22 is less than the set threshold or the difference in the overlap area is an integer multiple of the set value, which can reduce the discontinuity effect caused by the grid ground 2, effectively improve the symmetry of the differential signal line routing, and thus improve the data transmission stability of the differential signal group 1.
[0095] Figure 2 The diagram is a top view of the structure of a ground layer and a signal layer of another circuit board according to an exemplary embodiment.
[0096] In some embodiments, Figure 2 As shown, there may be a first angle between the differential signal line and the first ground line 21, the first angle may be θ, the spacing between the first differential signal line 11 and the second differential signal line 12 may be S, the spacing between the plurality of second ground lines 22 may be H, and the following relationship may be satisfied: Sinθ=S / H.
[0097] The first ground line 21 and the second ground line 22 include a plurality of intersections, for example, Figure 2 As shown, the intersections may include a first intersection 31 and a second intersection 32 which are arranged along the first ground line 21 and are adjacent to each other.
[0098] In order to reduce the asymmetric impact of the asymmetric grid ground 2 on the noise in the differential signal line, the wiring inclination angle of the grid ground 2 can be adjusted between 0° and 45° so that the intersection points of the grid ground 2 appear alternately on the two lines of the differential pair within the shortest differential signal line length, thereby achieving an equivalent symmetrical effect.
[0099] When the relationship between the first angle θ, the spacing S between the first differential signal line 11 and the second differential signal line 12, and the spacing H between the plurality of second ground lines 22 satisfies the relationship Sinθ=S / H, two adjacent intersections distributed along the first ground line 21 can be exactly located within the projections of the two differential signal lines on the ground layer. For example, Figure 2 As shown, the intersections may include a first intersection 31 and a second intersection 32 arranged and adjacent to the first ground line 21, wherein the first intersection 31 may be located within the projection of the second differential signal line 12 on the ground formation, and the second intersection 32 may be located within the projection of the first differential signal line 11 on the ground formation. The length of the differential signal line corresponding to the two intersections is L1.
[0100] By making two adjacent intersections appear alternately in the projection area of the two differential signal lines, the differential signal line can achieve the effect of equivalent symmetry of the grid ground 2 within the length L1. Therefore, within the length L1 of the differential signal line, the first ground line 21 and the second ground line 22 have the same influence on the differential signal of the first differential signal line 11 and the second differential signal line 12, which can make the common mode noise that experiences the same influence be offset when performing the difference operation when decoding the differential signal, thereby improving the data transmission stability of the differential signal group 1.
[0101] In some embodiments, the first angle may also be the angle between the differential signal line and the second ground line 22 .
[0102] Figure 3 The diagram is a top view of the structure of a ground layer and a signal layer of another circuit board according to an exemplary embodiment.
[0103] In some embodiments, Figure 3 As shown, the first angle θ also satisfies the following relationship: Sin(45°-θ)=S / (H / Sin45°).
[0104] When the relationship between the first angle θ, the spacing S between the first differential signal line 11 and the second differential signal line 12, and the spacing H between the plurality of second ground lines 22 satisfies the relationship Sin(45°-θ)=S / (H / Sin45°), the two adjacent intersections along the diagonal distribution of the grid of the grid ground 2 can be exactly located within the projections of the two differential signal lines on the ground layer, for example, Figure 3 As shown, the intersections may include a third intersection 33 and a fourth intersection 34 arranged and adjacent to the second ground line 22, wherein the third intersection 33 may be located within the projection of the first differential signal line 11 on the formation, and the fourth intersection 34 may be located within the projection of the second differential signal line 12 on the formation. The length of the differential signal line corresponding to the two intersections is L2.
[0105] By making two adjacent intersections appear alternately in the projection area of the two differential signal lines, the differential signal line can achieve the effect of equivalent symmetry of the grid ground 2 within the length L2. Therefore, within the length L2 of the differential signal line, the first ground line 21 and the second ground line 22 have the same influence on the differential signal of the first differential signal line 11 and the second differential signal line 12, which can make the common mode noise that experiences the same influence be offset when performing the difference operation when decoding the differential signal, thereby improving the data transmission stability of the differential signal group 1.
[0106] In some embodiments, the first angle θ is 15° to 38° or 105° to 128°.
[0107] The relationship Sin(45°-θ)=S / (H / Sin45°) can be further calculated to obtain the relationship Cosθ-Sinθ=S / H.
[0108] Since both intersection situations exist in the present disclosure, in order to ensure that the two intersection points can appear alternately in the projection area of the two differential lines within a shorter differential line length and realize the equivalent symmetry of the grid ground 2, the relationship Sinθ=S / H can be substituted into the relationship Cosθ-Sinθ=S / H for calculation, and it can be obtained that the range of the first angle θ can be 15°~38° or 105°~128°.
[0109] Exemplarily, the first angle θ between the differential signal line and the first ground line 21 may be set to 26.5° or 116.5°.
[0110] By setting the first angle θ between the differential signal line and the first ground line 21 to 15°~38° or 105°~128°, the discontinuity effect caused by the grid ground 2 can be reduced, and the symmetry of the influence of the grid ground 2 on the differential signal line can be effectively improved, so that the first ground line 21 and the second ground line 22 have similar influences on the differential signals of the first differential signal line 11 and the second differential signal line 12. This can make the common mode noise that experiences the same influence when decoding the differential signal be offset when performing the difference operation, thereby improving the data transmission stability of the differential signal group 1.
[0111] In some embodiments, the total length of the differential signal line can be greater than 10 times the length L1 of the differential signal line corresponding to the first intersection 31 and the second intersection 32. For example, when L1 is 0.35 mm, the total length of the differential signal line can be greater than or approximately equal to about 3.5 mm. When the total length of the differential signal line exceeds about 10 times L1, the influence of the local asymmetry of the grid ground 2 on the differential signal line can be reduced, so that the influence of the grid ground 2 on the differential signal line is generally symmetrical, so that the first ground line 21 and the second ground line 22 have similar influences on the differential signals of the first differential signal line 11 and the second differential signal line 12, which can make the common mode noise that experiences the same influence when decoding the differential signal be offset when performing the difference operation, thereby improving the data transmission stability of the differential signal group 1.
[0112] In some embodiments, the differential signal line transmits a first signal.
[0113] When the transmission length of the first signal is less than or equal to one sixth of the wavelength of the first signal, that is, when the first signal is a high-speed signal, the first angle may be 23.5° to 28.5° or 113.5° to 118.5°.
[0114] Since high-speed signals are more sensitive to noise signals, setting the first angle to 23.5°~28.5° or 113.5°~118.5° can reduce the discontinuity effect caused by the grid ground 2, and effectively improve the symmetry of the influence of the grid ground 2 on the differential signal line, so that the first ground line 21 and the second ground line 22 have similar influences on the differential signals of the first differential signal line 11 and the second differential signal line 12. This can make the common-mode noise that experiences the same influence when decoding the differential signal be offset during the difference operation, which can better reduce the influence of the noise signal on the high-speed signal, thereby improving the data transmission stability of the differential signal group 1.
[0115] When the transmission length of the first signal is greater than one sixth of the wavelength of the first signal, that is, the first signal is a low-speed signal, the first angle may be 15°-38° or 105°-128°.
[0116] Since low-speed signals have a greater tolerance for noise signals, setting the first angle to 23.5° to 28.5° or 113.5° to 118.5° can reduce the discontinuity effect caused by the grid ground 2, effectively improving the symmetry of the effect of the grid ground 2 on the differential signal line, so that the first ground line 21 and the second ground line 22 have similar effects on the differential signals of the first differential signal line 11 and the second differential signal line 12, which can make the common mode noise that experiences the same effect when decoding the differential signal be offset when performing the difference operation, thereby improving the data transmission stability of the differential signal group 1. It also improves the freedom of the routing design of the differential signal line and reduces the process difficulty in the production process.
[0117] In the present disclosure, the differential signal line may include a plurality of segments connected in sequence, and the extension direction of two segments connected to each other in the plurality of segments. In some embodiments, the angle between the extension directions of two segments connected to each other in the differential line is 45° or 90°.
[0118] For example, Figure 1 As shown, the differential signal line may include a first segment 101 and a second segment 102 extending in different directions, and the first segment 101 may be connected to the second segment 102 .
[0119] The angle between the extension direction of the first section 101 and the extension direction of the second section 102 may be 45° or 90°.
[0120] The differential signal line can be formed by connecting a plurality of first segments 101 and a plurality of second segments 102, thereby completing the routing design of the differential signal line.
[0121] Since the grid shape of the grid ground 2 is a square, by making different sections of the differential signal line differ by 45° or 90°, the angle between the differential signal line and the ground line in the first section 101, the angle between the differential signal line and the ground line in the second section 102, and the angle between the differential signal line and the ground line in the third section 103 can be equal.
[0122] Through the angular relationship between the different segments of the above-mentioned differential signal lines, the difference between the projection of the first differential signal line 11 and the second differential signal line 12 on the stratum and the overlapping area of the first ground line 21 and the second ground line 22 can be made less than a set threshold or the difference in the overlapping area is an integer multiple of the set value, which can reduce the discontinuity effect caused by the grid ground 2 and effectively improve the symmetry of the differential signal line routing, so that the first ground line 21 and the second ground line 22 have the same influence on the differential signals of the first differential signal line 11 and the second differential signal line 12, and then in the process of decoding the differential signal, the noise signals in the first differential signal line 11 and the second differential signal line 12 can be subtracted and offset, thereby improving the data transmission stability of the differential signal group 1.
[0123] Among them, when the angle between the extension direction of the first section 101 and the extension direction of the second section 102 is 90°, a transition section can be set between the first section 101 and the second section 102, and the angle between the extension direction of the transition section and the extension direction of the first section 101 can be 45°. The angle between the extension direction of the first section 101 and the extension direction of the second section 102 is both 45°. By setting the transition section, the connected corner part of the first section 101 and the second section 102 can have smaller signal reflection, thereby improving the data transmission stability of the differential signal group 1.
[0124] In some embodiments, the difference between the length of the first differential signal line 11 and the length of the second differential signal line 12 is less than a set threshold, thereby ensuring that the difference between the areas of the first differential signal line 11 and the second differential signal line 12 is less than the set threshold, and the difference in the area of the grid ground 2 covered by the routing is also less than the set threshold. Exemplarily, the difference between the length of the first differential signal line 11 and the length of the second differential signal line 12 can be 0, in which case the length of the first differential signal line 11 and the length of the second differential signal line 12 are equal.
[0125] In some embodiments, since the differential signal line includes a plurality of sections extending in different directions, when the extending direction changes, the outer loop length of the differential signal line at the corner will be greater than the inner loop length.
[0126] The angle change of the differential signal line when it is bent in the first direction is set to a positive number, and the angle change of the differential signal line when it can only be bent in the second direction is set to a negative number. By configuring the sum of the angle changes of multiple corners of the differential signal line to be 0 or less than a set threshold, the difference between the length of the first differential signal line 11 and the length of the second differential signal line 12 in the routing design can be made less than the set threshold, thereby ensuring that the difference in area between the first differential signal line 11 and the second differential signal line 12 is less than the set threshold, and the difference in area of the grid ground 2 covered by the routing is also less than the set threshold.
[0127] In some embodiments, Figure 1 As shown, the differential signal line may include a first segment 101 , a second segment 102 , and a third segment 103 extending in different directions. The first segment 101 may be connected to the second segment 102 , and the second segment 102 may be connected to the third segment 103 .
[0128] The angle between the extension direction of the first section 101 and the extension direction of the second section 102 can be 45°, the angle between the extension direction of the second section 102 and the extension direction of the third section 103 can be 45°, and the angle between the extension direction of the first section 101 and the extension direction of the third section 103 can be 0° or 90°.
[0129] The differential signal line can be formed by connecting a plurality of first segments 101 , second segments 102 and third segments 103 , thereby completing the routing design of the differential signal line.
[0130] Since the grid shape of the grid ground 2 is a square, by making different sections of the differential signal line differ by 45° or 90°, the angle between the differential signal line and the ground line in the first section 101, the angle between the differential signal line and the ground line in the second section 102, and the angle between the differential signal line and the ground line in the third section 103 can be equal.
[0131] Through the angular relationship between the different segments of the above-mentioned differential signal lines, the difference between the projection of the first differential signal line 11 and the second differential signal line 12 on the stratum and the overlapping area of the first ground line 21 and the second ground line 22 can be made less than a set threshold or the difference in the overlapping area is an integer multiple of the set value, which can reduce the discontinuity effect caused by the grid ground 2 and effectively improve the symmetry of the differential signal line routing, so that the first ground line 21 and the second ground line 22 have the same influence on the differential signals of the first differential signal line 11 and the second differential signal line 12, and then in the process of decoding the differential signal, the noise signals in the first differential signal line 11 and the second differential signal line 12 can be subtracted and offset, thereby improving the data transmission stability of the differential signal group 1.
[0132] Figure 4 The diagram is a top view of the structure of a ground layer and a signal layer of another circuit board according to an exemplary embodiment.
[0133] In some embodiments, Figure 4 As shown, the differential signal line may further include a third differential signal line 13, wherein the overlap area of the projection of the third differential signal line 13 on the stratum and the first ground line 21 and the second ground line 22 may be a third overlap area. The difference between the first overlap area, the second overlap area and the third overlap area is less than a set threshold or the difference in the overlap area is an integer multiple of the set value.
[0134] By configuring the first differential signal line 11, the second differential signal line 12 and the third differential signal line 13 so that the difference between their projections on the stratum and the overlapping areas of the first ground line 21 and the second ground line 22 is less than a set threshold or the difference in the overlapping areas is an integer multiple of a set value, the grid ground 2 is equivalently symmetrical relative to the first differential signal line 11 and the second differential signal line 12, so that the first ground line 21 and the second ground line 22 have the same influence on the differential signals of the first differential signal line 11 and the second differential signal line 12, which can make the common-mode noise that experiences the same influence when decoding the differential signal be offset when performing the difference operation, thereby improving the data transmission stability of the differential signal group 1.
[0135] Figure 5The single-ended insertion loss diagram of a channel is shown according to an embodiment of the related art. Figure 6 A single-ended phase diagram of a channel is shown according to an embodiment of the related art. Figure 7 is a single-ended noise result diagram shown according to an embodiment of the related art. Figure 8 is a differential mode noise result diagram shown according to an embodiment of the related art. Fig. 9 A signal eye diagram is shown according to an embodiment of the related art.
[0136] like Figures 5 to 9 As shown, the related art shows an embodiment with three differential signal lines, and the differential signal lines are at an angle of 45 degrees to the first ground line and the second ground line of the grid ground. The insertion loss difference between the three differential signal lines observed at the receiving end of the differential signal is 0.04dB, the phase difference is 0.95°, the RF differential noise amplitude is 16mV, the corresponding eye height is 127mV, and the eye width is 230.3ps.
[0137] Fig.10 is a diagram of single-ended insertion loss of a channel according to an exemplary embodiment. Fig.11 The figure is a single-ended phase diagram of a channel according to an exemplary embodiment. Fig.12 is a single-ended noise result diagram shown according to an exemplary embodiment. Fig.13 is a differential mode noise result diagram shown according to an exemplary embodiment. Fig.14 A signal eye diagram is shown according to an exemplary embodiment.
[0138] like Figures 10 to 14 As shown, the present disclosure shows an embodiment with three differential signal lines, and the first angle of the differential signal lines is 26.5°. The insertion loss difference between the three differential signal lines observed at the receiving end of the differential signal is 0.04dB, and the phase difference is 0.31°. The insertion loss and phase difference between the three lines are reduced, the RF differential noise is reduced to 0.36mV, the eye height is increased to 138mV, and the eye width is 233.1ps, which effectively improves the transmission stability of the differential signal.
[0139] Fig.15 The single-ended insertion loss diagram of a channel is shown according to an embodiment of the related art. Fig.16 A single-ended phase diagram of a channel is shown according to an embodiment of the related art. Fig.17 is a single-ended noise result diagram shown according to an embodiment of the related art. Fig.18 is a differential mode noise result diagram shown according to an embodiment of the related art. Fig.19 A signal eye diagram is shown according to an embodiment of the related art.
[0140] like Figures 15 to 19As shown, the related art shows an embodiment with three differential signal lines, and the differential signal lines are parallel to the first ground line or the second ground line of the grid ground. The insertion loss difference between the three differential signal lines observed at the receiving end of the differential signal is 0.27dB, the phase difference is 16.44°, the RF differential noise amplitude is 77mV, and the corresponding eye diagram is completely distorted.
[0141] Fig. 20 is a diagram of single-ended insertion loss of a channel according to an exemplary embodiment. Fig.21 The figure is a single-ended phase diagram of a channel according to an exemplary embodiment. Fig. 22 is a single-ended noise result diagram shown according to an exemplary embodiment. Fig.23 is a differential mode noise result diagram shown according to an exemplary embodiment. Fig.24 A signal eye diagram is shown according to an exemplary embodiment.
[0142] like Figure 20 to Figure 24 As shown, the present disclosure shows an embodiment with three differential signal lines, and the first angle of the differential signal lines is 26.5°. The insertion loss difference between the three differential signal lines observed at the receiving end of the differential signal is 0.03dB, the phase difference is 0.21°, the insertion loss and phase difference between the three lines are reduced, the RF differential noise amplitude is reduced to 1.3mV, the eye height is 145mV, and the eye width is 234.9ps, which effectively improves the transmission stability of the differential signal.
[0143] Fig.25 The single-ended insertion loss diagram of a channel is shown according to an embodiment of the related art. Fig.26 A single-ended phase diagram of a channel is shown according to an embodiment of the related art. Fig. 27 is a single-ended noise result diagram shown according to an embodiment of the related art. Fig.28 is a differential mode noise result diagram shown according to an embodiment of the related art. Fig.29 A signal eye diagram is shown according to an embodiment of the related art.
[0144] like Figure 25 to Figure 29 As shown, the related art shows an embodiment with two differential signal lines, and the differential signal lines are parallel to the first ground line or the second ground line of the grid ground. The insertion loss difference between the two differential signal lines observed at the receiving end of the differential signal is 0.651dB, the phase difference is 32.26°, the RF differential noise amplitude is 260mV, and the corresponding eye diagram is completely invalid, the eye height is 31mV, and the eye width is 248.2ps.
[0145] Fig.30 is a diagram of single-ended insertion loss of a channel according to an exemplary embodiment. Fig.31The figure is a single-ended phase diagram of a channel according to an exemplary embodiment. Fig.32 is a single-ended noise result diagram shown according to an exemplary embodiment. Fig.33 is a differential mode noise result diagram shown according to an exemplary embodiment. Fig.34 A signal eye diagram is shown according to an exemplary embodiment.
[0146] like Figure 30 to Figure 34 As shown, the present disclosure shows an embodiment with two differential signal lines, and the first angle of the differential signal lines is 26.5°. The insertion loss difference between the two differential signal lines observed at the receiving end of the differential signal is improved to 0.004dB, the phase difference is 0.171°, the insertion loss and phase difference between the two lines are reduced, the RF differential noise amplitude is reduced to 4.647mV, the eye height is increased to 304mV, and the eye width is also improved to a certain extent, which effectively improves the transmission stability of the differential signal.
[0147] Fig.35 The single-ended insertion loss diagram of a channel is shown according to an embodiment of the related art. Fig.36 A single-ended phase diagram of a channel is shown according to an embodiment of the related art. Fig.37 is a single-ended noise result diagram shown according to an embodiment of the related art. Fig.38 is a differential mode noise result diagram shown according to an embodiment of the related art. Fig.39 A signal eye diagram is shown according to an embodiment of the related art.
[0148] like Figure 35 to Figure 39 As shown, the related art shows an embodiment with two differential signal lines, and the differential signal lines are at an angle of 45 degrees to the first ground line and the second ground line of the grid ground. The insertion loss difference between the two differential signal lines observed at the receiving end of the differential signal is 0.17dB, the phase difference is 3.04°, the RF differential noise amplitude is 38mV, the corresponding eye height is 281mV, and the eye width is 455.3ps.
[0149] Fig.40 is a diagram of single-ended insertion loss of a channel according to an exemplary embodiment. Fig.41 The figure is a single-ended phase diagram of a channel according to an exemplary embodiment. Fig.42 is a single-ended noise result diagram shown according to an exemplary embodiment. Fig.43 is a differential mode noise result diagram shown according to an exemplary embodiment. Fig.44 A signal eye diagram is shown according to an exemplary embodiment.
[0150] like Figures 40 to 44As shown, the present disclosure shows an embodiment with two differential signal lines, and the first angle of the differential signal lines is 26.5°. The insertion loss difference between the two differential signal lines observed at the receiving end of the differential signal is improved to 0.0004dB, the phase difference is 0.171°, the insertion loss and phase difference between the two lines are reduced, the RF differential noise amplitude is reduced to 4.647mV, the eye height is increased to 304mV, and the eye width is also significantly improved, which effectively improves the transmission stability of the differential signal.
[0151] Based on the same concept, an embodiment of the present disclosure also provides an electronic device.
[0152] The electronic device may be a laptop computer, a desktop computer, a mobile phone, a digital broadcast terminal, a message transceiver, a game console, a tablet device, a medical device, a fitness device, a personal digital assistant, a translator, and a wearable device such as a watch or a bracelet, and may be any electronic device having a circuit board. In the following description, a mobile phone is used as an example, but the present disclosure is not limited thereto.
[0153] In some embodiments, the electronic device may include a circuit board. By using a grid ground 2 as the bottom layer in the circuit board, the bending reliability of the circuit board can be ensured, and the flexibility of product structure design stacking is improved. By making the difference between the projection of the differential signal line in the differential signal group 1 on the ground layer and the overlapping area of the grid ground 2 less than a set threshold or the difference in the overlapping area is an integer multiple of the set value, the discontinuity effect caused by the grid ground 2 can be reduced, and the symmetry of the differential signal line routing can be effectively improved, so that the grid ground 2 has the same effect on the noise signal in the differential signal line, and then in the process of decoding the differential signal, the noise signal in the differential signal line can be subtracted and offset, thereby improving the data transmission stability of the differential signal group 1.
[0154] In some embodiments, the circuit board is a flexible circuit board.
[0155] The disclosed embodiment reduces the discontinuity effect caused by the grid ground 2 by making the difference between the projection of the differential signal line in the differential signal group 1 on the stratum and the overlapping area of the grid ground 2 smaller than a set threshold or the difference in the overlapping area is an integer multiple of the set value, thereby effectively improving the symmetry of the routing of the differential signal line, so that the grid ground 2 has the same effect on the noise signal in the differential signal line, and further, in the process of decoding the differential signal, the noise signal in the differential signal line can be subtracted and offset, thereby improving the data transmission stability of the differential signal group 1.
[0156] It is to be understood that in the present disclosure, "plurality" refers to two or more than two, and other quantifiers are similar. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the associated objects before and after are in an "or" relationship. The singular forms "a", "the" and "the" are also intended to include plural forms, unless the context clearly indicates other meanings.
[0157] It is further understood that the terms "second", "secondary", etc. are used to describe various information, but such information should not be limited to these terms. These terms are only used to distinguish information of the same type from each other and do not indicate a specific order or degree of importance. In fact, the expressions "secondary", "secondary", etc. can be used interchangeably. For example, without departing from the scope of the present disclosure, the second information may also be referred to as the second information, and similarly, the second information may also be referred to as the second information.
[0158] It will be further understood that the terms “center”, “longitudinal”, “lateral”, “front”, “back”, “up”, “down”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present embodiment and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation.
[0159] It can be further understood that, unless otherwise specified, “connection” includes a direct connection without other components between the two, and also includes an indirect connection with other components between the two.
[0160] It is further understood that, although the operations are described in a specific order in the drawings in the embodiments of the present disclosure, it should not be understood as requiring the operations to be performed in the specific order shown or in a serial order, or requiring the execution of all the operations shown to obtain the desired results. In certain environments, multitasking and parallel processing may be advantageous.
[0161] Those skilled in the art will readily appreciate other embodiments of the present disclosure after considering the specification and practicing the invention disclosed herein. This application is intended to cover any modification, use or adaptation of the present disclosure, which follows the general principles of the present disclosure and includes common knowledge or customary techniques in the art that are not disclosed in the present disclosure. The specification and examples are intended to be exemplary only, and the true scope and spirit of the present disclosure are indicated by the following scope of rights.
[0162] It should be understood that the present disclosure is not limited to the precise structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the scope of the appended claims.
Claims
1. A circuit board, characterized in that: The circuit board comprises: The signal layer is provided with one or more differential signal groups, wherein the differential signal groups include a plurality of differential signal lines parallel to each other; a stratum, the stratum comprising a grid ground, Among them, the difference between the overlapping area of the projection of each differential signal line in at least one differential signal group on the stratum and the grid ground is less than a set threshold; or the difference in the overlapping area is an integer multiple of a set value.
2. The circuit board according to claim 1, characterized in that: The differential signal group includes a first differential signal line and a second differential signal line; The grid ground includes a plurality of intersecting first ground lines and a plurality of second ground lines, Wherein, the overlapping area of the projection of the first differential signal line on the ground layer and the first ground line and the second ground line is a first overlapping area; The overlapping area of the projection of the second differential signal line on the ground layer and the first ground line and the second ground line is a second overlapping area; The difference between the first overlap area and the second overlap area is less than a set threshold, or The difference between the first overlapping area and the second overlapping area is an integer multiple of a set value.
3. The circuit board according to claim 2, characterized in that: There is a first angle between the differential signal line and the first ground line, and the differential signal line transmits a first signal; The transmission length of the first signal is less than or equal to one sixth of the wavelength of the first signal, and the first angle is 23.5° to 28.5° or 113.5° to 118.5°; The transmission length of the first signal is greater than one sixth of the wavelength of the first signal, and the first angle is 15°-38° or 105°-128°.
4. The circuit board according to claim 2, characterized in that: A plurality of first ground lines are arranged in parallel with each other in the ground layer, and a plurality of second ground lines are arranged in parallel with each other in the ground layer.
5. The circuit board according to claim 2, characterized in that: A plurality of first ground lines are arranged in the ground layer at equal intervals, and a plurality of second ground lines are arranged in the ground layer at equal intervals.
6. The circuit board according to claim 2, characterized in that: The first ground line and the second ground line are perpendicular to each other.
7. The circuit board according to claim 2, characterized in that: There is a first angle between the differential signal line and the first ground line, the first angle is θ, the spacing between the first differential signal line and the second differential signal line is S, the spacing between the plurality of second ground lines is H, and the following relationship is satisfied: Sinθ=S / H.
8. The circuit board according to claim 7, characterized in that: The first angle also satisfies the following relationship: Sin(45°-θ)=S / (H / Sin45°).
9. The circuit board according to claim 8, characterized in that: The first angle is 15° to 38° or 105° to 128°.
10. The circuit board according to claim 9, characterized in that: The differential signal line includes a plurality of segments connected in sequence, and the extension direction of two segments connected to each other in the plurality of segments is Wherein, the angle between the extension directions of the two segments connected to each other is 45° or 90°.
11. The circuit board according to claim 9, characterized in that: The differential signal line includes a first section, a second section and a third section extending in different directions, the first section is connected to the second section, the second section is connected to the third section, Wherein, the angle between the extension direction of the first section and the extension direction of the second section is 45°; The included angle between the extension direction of the second section and the extension direction of the third section is 45°; The included angle between the extension direction of the first section and the extension direction of the third section is 0° or 90°.
12. The circuit board according to claim 2, characterized in that: A difference between the length of the first differential signal line and the length of the second differential line is smaller than a set threshold.
13. The circuit board according to claim 2, characterized in that: The differential signal line further includes a third differential signal line; Wherein, the overlapping area of the projection of the third differential signal line on the ground layer and the first ground line and the second ground line is a third overlapping area; The difference between the first overlap area, the second overlap area and the third overlap area is less than a set threshold; or the difference between the overlap areas is an integer multiple of a set value; A difference among the length of the first differential signal line, the length of the second differential line, and the length of the third differential line is smaller than a set threshold.
14. The circuit board according to claim 1, characterized in that: The length of the differential signal line is greater than or equal to 3.5 mm.
15. An electronic device, characterized in that: include: A circuit board as claimed in any one of claims 1 to 14.
16. The electronic device according to claim 15, characterized in that: The circuit board is a flexible circuit board.